The SPDR S&P 500 ETF (NYSEArca: SPY) is testing the 2000/2007 highs — levels only reached at the peak of two previous bubbles. This report looks at the last two bull/bear markets in the S&P 500 via the SPR S&P 500 ETF (NYSEArca: SPY) to see if there is anything to learn from the...